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THE JOURNAL OF SPORTS MEDICINE AND PHYSICAL FITNESS
A Journal on Applied Physiology, Biomechanics, Preventive Medicine,
Sports Medicine and Traumatology, Sports Psychology
Indexed/Abstracted in: Chemical Abstracts, CINAHL, Current Contents/Clinical Medicine, EMBASE, PubMed/MEDLINE, Science Citation Index Expanded (SciSearch), Scopus
Impact Factor 1,111
The Journal of Sports Medicine and Physical Fitness 2016 Jul 08
Change of direction ability in young elite soccer players: determining factors vary with angle variation
Mehdi ROUISSI 1, Moktar CHTARA 1, Adam OWEN 2, Angus BURNETT 3, Karim CHAMARI 3 ✉
1 Tunisian Research Laboratory ‘‘Sport Performance Optimization’’, National Center of Medicine and Science in Sports, Tunis, Tunisia; 2 Servette Football Club, Geneva, Switzerland; 3 Athlete Health and Performance Aspetar, Qatar Orthopaedic and Sports Medicine Hospital, Doha, Qatar
BACKGROUND: The ability to change direction is considered of paramount importance in team sports. Currently there is a lack of consensus regarding the most important physical factors that determine change of direction (COD) ability. Therefore, the aim of this study was to examine the relationship strength and explosive power.
METHODS: 31 young elite soccer players (mean±SD, age=17.4±0.6year, height=177±0.5cm; leg length=96.9±3.3cm, body-mass=69.0±6.2kg) were recruited. A total of eight COD tasks consisting of; a 5m sprint then a COD of 45°, 90°, 135° or 180° followed by another 5m sprint were performed using dominant (DL) and non-dominant legs (NDL). Physical tests including a 10 m straight-line sprint test (10m SS), 12 lower limb isometric strength tests, and jumping tests including i) five alternate leg jump-test (5JT) ii) triple hop distance (3HD) (DL and NDL) and iii) standing broad jump-test (SBJ) were performed.
RESULTS: Stepwise multiple regression analysis showed that the physical attributes explained between 30% and 74% of the variance of the COD performance. Furthermore, these physical attributes were dependent upon COD angle and direction.
CONCLUSIONS: The affecting variables of the COD performance differ according to the angle of between COD ability and targeted selected physical attributes of sprinting, isometric COD and the leg used to turn. Moreover, isometric strength of the lower-limb muscles represented a major determinant factor of the COD-ability. Consequently, physical fitness coaches should include isometric muscle strengthening exercises in addition to traditional dynamic muscle strength exercises. Moreover, they should implement specific lower limb strength exercises depending on players’ deficit in each COD’s angles.